Muwatta Malik #412
Shortening the Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ مَنْ نَسِيَ صَلاَةً فَلَمْ يَذْكُرْهَا إِلاَّ وَهُوَ مَعَ الإِمَامِ فَإِذَا سَلَّمَ الإِمَامُ فَلْيُصَلِّ الصَّلاَةَ الَّتِي نَسِيَ ثُمَّ لِيُصَلِّ بَعْدَهَا الأُخْرَى .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar
used to say, "Someone who only remembers that he has forgotten a
prayer when he is praying the next prayer behind an imam, should pray
the prayer he has forgotten after the imam has said the taslim, and
then pray the other one again."
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About Muwatta Malik
This hadith is #412 from Muwatta Malik, in the Book of Shortening the Prayer.